延边地区狼巴草的生态学特性及其防除技术

狼巴草属于外来草，是延边地区的检疫对象．延边地区五大河流流域均大量发生美国狼巴草(Bidens frondosa L．)和狼巴草(Bidens tripartita L．)，同时在龙井地区稻田还发现柳叶鬼针草(Bidens cernua L．)．狼巴草已经成为稻田周围的优势草种，开始侵入稻田．稻田深水管理可以抑制狼巴草种子的发芽出土；稻田化学除草剂在正常剂量条件下，丁草胺(Butachlur：60％，1500mL／hm^2)药效差，农得时(Bensulfuron—methyl：10％，300g／hm^2)、草克星(Pyrazosul—fulron—ethyl：10％，210g／hm^2)药效较好，苯达松(Bentazone：48％，3000mL／hm^2)、2甲4氯钠盐(MCPA：70％，1000g／hm^2)药效最佳．

Ecological characteristics and preventive technology of Bidens in Yanbian area

Bidens are ab-extra and quarantine weeds of Yanbian area. Enormous Bidens fron-dosa L. and Bidens tripartite L. occurred in the drainage areas of five rivers in Yanbian area. Bidens cernua L. were found in the rice fields of Longjing area. Bidens had begun to invaded into the rice fields and become predominant weeds around the fields. The sprouting of Bidens seeds could be restrained by deep-water management. The preventive effects of butachlur(60% 1500 mL/hm2) was inferior, bensulfuron-methyl(10% 300 g/hm2) and pyrazosulfulron-ethyl (10% 210 g/hm2) were quite good. The effect of bentazone(48% 3000 mL/hm2) and MCPA (70% 1000 g/hm2) were the best.